nobisut/src/utils/utils.ts

Javascript SDK for the Wyvern Protocol

/* Sourced from 0x.js */

import { BigNumber } from '@0xproject/utils';
import BN = require('bn.js');
import * as ethABI from 'ethereumjs-abi';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';

import { Order, SignedOrder, SolidityTypes } from '../types';

export const utils = {
    /**
     * Converts BigNumber instance to BN
     * The only reason we convert to BN is to remain compatible with `ethABI. soliditySHA3` that
     * expects values of Solidity type `uint` to be passed as type `BN`.
     * We do not use BN anywhere else in the codebase.
     */
    bigNumberToBN(value: BigNumber) {
        return new BN(value.toString(), 10);
    },
    consoleLog(message: string): void {
        // tslint:disable-next-line: no-console
        console.log(message);
    },
    isParityNode(nodeVersion: string): boolean {
        return _.includes(nodeVersion, 'Parity');
    },
    isTestRpc(nodeVersion: string): boolean {
        return _.includes(nodeVersion, 'TestRPC');
    },
    spawnSwitchErr(name: string, value: any): Error {
        return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
    },
    getAssetHashHex(assetHash: string, schema: string): string {
      const concat = schema + ':' + assetHash;
      const hashBuf = ethABI.soliditySHA3(['string'], [concat]);
      return ethUtil.bufferToHex(hashBuf);
    },
    getOrderHashHex(order: Order | SignedOrder): string {
        const orderPartsA = [
            { value: order.exchange, type: SolidityTypes.Address },
            { value: order.maker, type: SolidityTypes.Address },
            { value: order.taker, type: SolidityTypes.Address },
            { value: utils.bigNumberToBN(order.makerRelayerFee), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.takerRelayerFee), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.makerProtocolFee), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.takerProtocolFee), type: SolidityTypes.Uint256 },
            { value: order.feeRecipient, type: SolidityTypes.Address },
            { value: order.feeMethod, type: SolidityTypes.Uint8 },
            { value: order.side, type: SolidityTypes.Uint8 },
            { value: order.saleKind, type: SolidityTypes.Uint8 },
            { value: order.target, type: SolidityTypes.Address },
            { value: order.howToCall, type: SolidityTypes.Uint8 },
        ];
        const orderPartsB = [
            { value: new Buffer(order.calldata.slice(2), 'hex'), type: SolidityTypes.Bytes },
            { value: new Buffer(order.replacementPattern.slice(2), 'hex'), type: SolidityTypes.Bytes },
            { value: order.staticTarget, type: SolidityTypes.Address },
            { value: new Buffer(order.staticExtradata.slice(2), 'hex'), type: SolidityTypes.Bytes },
            { value: order.paymentToken, type: SolidityTypes.Address },
            { value: utils.bigNumberToBN(order.basePrice), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.extra), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.listingTime), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.expirationTime), type: SolidityTypes.Uint256 },
            { value: utils.bigNumberToBN(order.salt), type: SolidityTypes.Uint256 },
        ];
        const typesA = _.map(orderPartsA, o => o.type);
        const valuesA = _.map(orderPartsA, o => o.value);
        const hashBufA = ethABI.soliditySHA3(typesA, valuesA);
        const typesB = _.map(orderPartsB, o => o.type);
        const valuesB = _.map(orderPartsB, o => o.value);
        const hashBufB = ethABI.soliditySHA3(typesB, valuesB);
        const orderPartsC = [
            { value: '\x19Ethereum Signed Message:\n32', type: SolidityTypes.String },
            { value: hashBufA, type: SolidityTypes.Bytes },
            { value: hashBufB, type: SolidityTypes.Bytes },
        ];
        const typesC = _.map(orderPartsC, o => o.type);
        const valuesC = _.map(orderPartsC, o => o.value);
        const hashBufC = ethABI.soliditySHA3(typesC, valuesC);
        const hashHexC = ethUtil.bufferToHex(hashBufC);
        return hashHexC;
    },
    getCurrentUnixTimestampSec(): BigNumber {
        return new BigNumber(Date.now() / 1000).round();
    },
    getCurrentUnixTimestampMs(): BigNumber {
        return new BigNumber(Date.now());
    },
};